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btrfs: add the ability to use NO_FLUSH for data reservations

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In order to accommodate NOWAIT IOCB's we need to be able to do NO_FLUSH
data reservations, so plumb this through the delalloc reservation
system.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Stefan Roesch <shr@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-09-12 12:27:44 -07:00 committed by David Sterba
parent 26ce911446
commit 1daedb1d6b
6 changed files with 18 additions and 9 deletions
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2
fs/btrfs/block-group.c
View File

@ -2850,7 +2850,7 @@ again:
cache_size *= fs_info->sectorsize;
ret = btrfs_check_data_free_space(BTRFS_I(inode), &data_reserved, 0,
cache_size);
cache_size, false);
if (ret)
goto out_put;

13
fs/btrfs/delalloc-space.c
View File

@ -127,9 +127,11 @@ int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes)
}
int btrfs_check_data_free_space(struct btrfs_inode *inode,
struct extent_changeset **reserved, u64 start, u64 len)
struct extent_changeset **reserved, u64 start,
u64 len, bool noflush)
{
struct btrfs_fs_info *fs_info = inode->root->fs_info;
enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_DATA;
int ret;
/* align the range */
@ -137,7 +139,12 @@ int btrfs_check_data_free_space(struct btrfs_inode *inode,
round_down(start, fs_info->sectorsize);
start = round_down(start, fs_info->sectorsize);
ret = btrfs_alloc_data_chunk_ondemand(inode, len);
if (noflush)
flush = BTRFS_RESERVE_NO_FLUSH;
else if (btrfs_is_free_space_inode(inode))
flush = BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE;
ret = btrfs_reserve_data_bytes(fs_info, len, flush);
if (ret < 0)
return ret;
@ -454,7 +461,7 @@ int btrfs_delalloc_reserve_space(struct btrfs_inode *inode,
{
int ret;
ret = btrfs_check_data_free_space(inode, reserved, start, len);
ret = btrfs_check_data_free_space(inode, reserved, start, len, false);
if (ret < 0)
return ret;
ret = btrfs_delalloc_reserve_metadata(inode, len, len, false);

3
fs/btrfs/delalloc-space.h
View File

@ -7,7 +7,8 @@ struct extent_changeset;
int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
int btrfs_check_data_free_space(struct btrfs_inode *inode,
struct extent_changeset **reserved, u64 start, u64 len);
struct extent_changeset **reserved, u64 start, u64 len,
bool noflush);
void btrfs_free_reserved_data_space(struct btrfs_inode *inode,
struct extent_changeset *reserved, u64 start, u64 len);
void btrfs_delalloc_release_space(struct btrfs_inode *inode,

2
fs/btrfs/file.c
View File

@ -1663,7 +1663,7 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb,
extent_changeset_release(data_reserved);
ret = btrfs_check_data_free_space(BTRFS_I(inode),
&data_reserved, pos,
write_bytes);
write_bytes, false);
if (ret < 0) {
/*
* If we don't have to COW at the offset, reserve

4
fs/btrfs/inode.c
View File

@ -4885,7 +4885,7 @@ int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
block_end = block_start + blocksize - 1;
ret = btrfs_check_data_free_space(inode, &data_reserved, block_start,
blocksize);
blocksize, false);
if (ret < 0) {
if (btrfs_check_nocow_lock(inode, block_start, &write_bytes) > 0) {
/* For nocow case, no need to reserve data space */
@ -7641,7 +7641,7 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
if (write && !(flags & IOMAP_NOWAIT)) {
ret = btrfs_check_data_free_space(BTRFS_I(inode),
&dio_data->data_reserved,
start, data_alloc_len);
start, data_alloc_len, false);
if (!ret)
dio_data->data_space_reserved = true;
else if (ret && !(BTRFS_I(inode)->flags &

3
fs/btrfs/space-info.c
View File

@ -1760,7 +1760,8 @@ int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes,
int ret;
ASSERT(flush == BTRFS_RESERVE_FLUSH_DATA ||
flush == BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE);
flush == BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE ||
flush == BTRFS_RESERVE_NO_FLUSH);
ASSERT(!current->journal_info || flush != BTRFS_RESERVE_FLUSH_DATA);
ret = __reserve_bytes(fs_info, data_sinfo, bytes, flush);